I use claude and chatGPT all the time but I just don't see how language models can help me with email.
Typing the words is never the bottleneck.
The problem is trying to express what needs to be expressed with such clarity as to not cause any misunderstanding and then more email.
Summarizing an old, long thread could have some value but that is such an edge case.
I would be the main customer for this type of product but I just don't see much value in it at all.